Cutter-head fob



C. P. MORTON.

CUTTER HEAD FOR LAST LATHES.

APPLICATION FILED APR. n. 1911.

1,326,135. v Patented De0.23,1919.

.imrrsn s rains Parana oration. I

To all whom it may concern:

Be fit'. known thatfl, CHARLES P. MORTON, a citizen of the UnitedStatesof America, and resident of Oincinnathinthe'county of Hamilton andsmear Qhio, have-invented a new and usefulTmprovementinCutter- Heads forLast-Lathes, of which'the following is a specification.

An object of my invention is a cutter head of compact form, comprisingroughing and smoothing cutters, by which a drawing out maybe made.

Another object of my invention is a combined roughing and finishingcutter head, in which knives of high grade steel may be used withoutincreasing the cost of the cutter head.

A further object of my invention is a cutter head, in which the labornecessary to keep the knives sharp, is small.

A further object of iny invention is a cutter head of compact form.

These objects are attained by the means described in the specificationand illustrated in the accompanying drawin s, in which,

Figure 1 is a plan view 0 my improved cutter head. i

Fig. 2 is a side elevation of my improved cutter head. 7

Fig. 3 is a perspective view of my improved cutter head.

Fig. 4 is a perspective view of one of the finishing cutters andfastening means employed therefor.

Fig. 5 is a front elevation of a cutter head embodying myinvention, anda shoe last mounted in position for being operated upon by my cutter.

My improved cutter head consists of a body 5, which is in the form of afrustum of a cone, and has at its larger end longitudinally extendinglugs 6 and 7, whose periphery conforms to the lines of the frustum ofthe cone. Adjacent to the lugs 6 and 7 are longitudinal slots 12, whichare at an angleto the radii of the body portion. The body portion 5 andlugs 6 and 7 are made integral. and are formed from machme steel.Roughing cutters 13 consist of thick blades of tool steel and havebeveled cutting edges. When the knives are mounted in their slots, theinner edges of the bevel are'fiush with the adjacent surface of the body5, and the cutting edges project beyond the periphery thereof. Theknives are held in place by means of set screws 15, which CHARLES r.MORTON, on cINcInNA'rI,

OHIO.

CUTTER-HEAD FOR LASVT-IIATHES.

Patented Dec. 23,1919.

: Application filerlApril 11, 1917. serial No. 161,140.

are seated in bores," which areformed in the body 5, adj aceiit totheslots lfl and at a slight angle "to' a tangent tdthefiperiphery'ofthe body The set screws15 engagerecesses "16, which are formed in theknives 13.

The knives 13 are made of a length, such 1 i that their outer edgesproject slightly into the annular paths of the finishing cutters.

The finishing cutters 8 and 9 are made in the form of frustums of conesand have circular beveled cutting edges 11. These finishing cutters havecentral perforations to receive screws 10, which engage holes centrallylocated in the lugs 6 and 7. To hold the finishing cutters 8 and 9 fromrotation, I provide keys 8 and 9 which engage radial slots upon the backof the cutters and longitudinal slotsupon the inner faces of the lugs 6and 7 The cutter is mounted upon its spindle 15, with the smaller end ofthe body portion nearest to the bearing 16 of the spindle. In

1 operation, the cutter is moved past its work,

so that the axis of the spindle is at an angle to the longitudinal axisofthe work, and the bearing 16 of the spindle moves past the work inadvance of the cutter, so that the roughing knives 13 and 14:, as wellas the finishing knives 8 and 9 operate upon the work with a drawing outas distinguished from a chopping cut.

The roughing knives 13 and the finishing knives 8 and 9 may be made ofthe expensive steel, known as tool steel, because the amount of materialin them is small compared with that in the body portion 5. This toolsteel holds its cutting edge for a much longer time than ordinary steel.Moreover, the form of the roughing cutters 13 is such and the manner ofmounting them in the body 5 is such, that they are readily removed andsharpened. The finishing cutters may be moved to four differentpositions by removing the keys, before they require removal from thehead for resharpenmg.

Since the lugs 6 and 7 are formed longitudinally upon the body portion5, and conform with the general contour of the body portion 5, and sincethe cutting edges of the finishing cutters and of the roughing cuttersconform to the general outline of a frustum of a cone, I am able toprovide a knife which has a compact form.

What I claim is:

1. A cutter head for last lathes comprisa body portion in the shape of afrustum of a cone and mounted upon the spindle with its smaller endinward, straight edged cutters mounted longitudinally upon the smallerend of the body portion and curved edged cutters mounted upon the largerend of the body portion and with their axis transverse to the spindle.

2. A cutter head for last lat-hes, comprising a body portion havinglongitudinal slots in its sides and longitudinally extending lugs at itsend, longitudinal roughing knives mounted in the longitudinal slots, andcircular finishing knives mounted upon the lugs.

ing a spindle,

3. A cutter head having a body portion of the shape of the frustum of acone, longitudinal slots in the sides of the body portion, andlongitudinal lugs upon the larger end of the body portion, longitudinalrou hing knives in the slots, and circular finishing cutters mountedupon the lugs. V

In testimony whereof, I have hereunto iigpgcribed my name this 9th dayof April,

CHAS. P. MORTON.

Witnesses:

WALTER F. MURRAY, W. THORNTON BOGERT.

